'use strict'

const ERR_MSG_OK = 'chooseAndUploadFile:ok'
const ERR_MSG_FAIL = 'chooseAndUploadFile:fail'

function chooseImage(opts) {
  const { count, sizeType = ['original', 'compressed'], sourceType = ['album', 'camera'], extension } = opts
  return new Promise((resolve, reject) => {
    uni.chooseImage({
      count,
      sizeType,
      sourceType,
      extension,
      success(res) {
        resolve(normalizeChooseAndUploadFileRes(res, 'image'))
      },
      fail(res) {
        reject({
          errMsg: res.errMsg.replace('chooseImage:fail', ERR_MSG_FAIL)
        })
      }
    })
  })
}

function chooseVideo(opts) {
  const { camera, compressed, maxDuration, sourceType = ['album', 'camera'], extension } = opts
  return new Promise((resolve, reject) => {
    uni.chooseVideo({
      camera,
      compressed,
      maxDuration,
      sourceType,
      extension,
      success(res) {
        const { tempFilePath, duration, size, height, width } = res
        resolve(
          normalizeChooseAndUploadFileRes(
            {
              errMsg: 'chooseVideo:ok',
              tempFilePaths: [tempFilePath],
              tempFiles: [
                {
                  name: (res.tempFile && res.tempFile.name) || '',
                  path: tempFilePath,
                  size,
                  type: (res.tempFile && res.tempFile.type) || '',
                  width,
                  height,
                  duration,
                  fileType: 'video',
                  cloudPath: ''
                }
              ]
            },
            'video'
          )
        )
      },
      fail(res) {
        reject({
          errMsg: res.errMsg.replace('chooseVideo:fail', ERR_MSG_FAIL)
        })
      }
    })
  })
}

function chooseAll(opts) {
  const { count, extension } = opts
  return new Promise((resolve, reject) => {
    let chooseFile = uni.chooseFile
    if (typeof wx !== 'undefined' && typeof wx.chooseMessageFile === 'function') {
      chooseFile = wx.chooseMessageFile
    }
    if (typeof chooseFile !== 'function') {
      return reject({
        errMsg: ERR_MSG_FAIL + ' 请指定 type 类型，该平台仅支持选择 image 或 video。'
      })
    }
    chooseFile({
      type: 'all',
      count,
      extension,
      success(res) {
        resolve(normalizeChooseAndUploadFileRes(res))
      },
      fail(res) {
        reject({
          errMsg: res.errMsg.replace('chooseFile:fail', ERR_MSG_FAIL)
        })
      }
    })
  })
}

function normalizeChooseAndUploadFileRes(res, fileType) {
  res.tempFiles.forEach((item, index) => {
    if (!item.name) {
      item.name = item.path.substring(item.path.lastIndexOf('/') + 1)
    }
    if (fileType) {
      item.fileType = fileType
    }
    item.cloudPath = Date.now() + '_' + index + item.name.substring(item.name.lastIndexOf('.'))
  })
  if (!res.tempFilePaths) {
    res.tempFilePaths = res.tempFiles.map(file => file.path)
  }
  return res
}

function uploadCloudFiles(files, max = 5, onUploadProgress) {
  files = JSON.parse(JSON.stringify(files))
  const len = files.length
  let count = 0
  let self = this
  return new Promise(resolve => {
    while (count < max) {
      next()
    }

    function next() {
      let cur = count++
      if (cur >= len) {
        !files.find(item => !item.url && !item.errMsg) && resolve(files)
        return
      }
      const fileItem = files[cur]
      const index = self.files.findIndex(v => v.uuid === fileItem.uuid)
      fileItem.url = ''
      delete fileItem.errMsg

      uniCloud
        .uploadFile({
          filePath: fileItem.path,
          cloudPath: fileItem.cloudPath,
          fileType: fileItem.fileType,
          onUploadProgress: res => {
            res.index = index
            onUploadProgress && onUploadProgress(res)
          }
        })
        .then(res => {
          fileItem.url = res.fileID
          fileItem.index = index
          if (cur < len) {
            next()
          }
        })
        .catch(res => {
          fileItem.errMsg = res.errMsg || res.message
          fileItem.index = index
          if (cur < len) {
            next()
          }
        })
    }
  })
}

function uploadFiles(choosePromise, { onChooseFile, onUploadProgress }) {
  return choosePromise
    .then(res => {
      if (onChooseFile) {
        const customChooseRes = onChooseFile(res)
        if (typeof customChooseRes !== 'undefined') {
          return Promise.resolve(customChooseRes).then(chooseRes =>
            typeof chooseRes === 'undefined' ? res : chooseRes
          )
        }
      }
      return res
    })
    .then(res => {
      if (res === false) {
        return {
          errMsg: ERR_MSG_OK,
          tempFilePaths: [],
          tempFiles: []
        }
      }
      return res
    })
}

function chooseAndUploadFile(
  opts = {
    type: 'all'
  }
) {
  if (opts.type === 'image') {
    return uploadFiles(chooseImage(opts), opts)
  } else if (opts.type === 'video') {
    return uploadFiles(chooseVideo(opts), opts)
  }
  return uploadFiles(chooseAll(opts), opts)
}

export { chooseAndUploadFile, uploadCloudFiles }
